Rathamani was born in Kalinjikuppam, a village of Villupuram district, to a family of farmers.
[1] Rathamani contested his first Tamil Nadu Legislative Assembly election in 2011 and lost.
[1] He was elected from Vikravandi in 2016 as a member of the Dravida Munnetra Kazhagam, succeeding R.
[1] Rathamani was diagnosed with stomach cancer,[2] for which he first sought treatment in Chennai.
[1] Rathamani continued treatment at the Jawaharlal Institute of Postgraduate Medical Education and Research Hospital for three months prior to his death on 14 June 2019.